package Experiment;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;

/**
 * 清空购物车数据表
 */
public class delectCar extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //设置服务器端以UTF-8编码进行输出
        resp.setCharacterEncoding("UTF-8");
        //设置浏览器以UTF-8编码进行接收,解决中文乱码问题
        resp.setContentType("text/html;charset=UTF-8");
        PrintWriter out = resp.getWriter();
        String Na = req.getParameter("delIt");
        String num = req.getParameter("num");//需要对修改数量进行正负数判断。
        String del = req.getParameter("del");
        try {
            try {
                String url = "jdbc:sqlserver://localhost:1433;DataBaseName=Login;integratedSecurity=true;";
                Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
                Connection comm = DriverManager.getConnection(url);
                if (del != null) {
                    String sql = "update Book set bookNO= null ";
                    Statement st = comm.createStatement();
                    //5 执行sql语句
                    int temp = st.executeUpdate(sql);
                    System.out.println("返回的值：" + temp);
                    //6 关闭sql对象
                    st.close();
                    //7 关闭连接
                    comm.close();
                    resp.setHeader("refresh", "0.1,http://localhost:8080/javaWeb_war_exploded/GoodCar.jsp");
                } else {
                    String sql = "update Book set bookNO=('" + num + "') where bookName='" + Na + "'";
                    Statement st = comm.createStatement();
                    //5 执行sql语句
                    int temp = st.executeUpdate(sql);
                    System.out.println("返回的值：" + temp);
                    //6 关闭sql对象
                    st.close();
                    //7 关闭连接
                    comm.close();
                    resp.setHeader("refresh", "0.1,http://localhost:8080/javaWeb_war_exploded/GoodCar.jsp");
                }
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
